html{
	height: 100%;
}
body{
	overflow: hidden;
	margin: 0;
	height: 100%;
}
header{
	width:250px;
	height: 100%;
	float: left;
	background: #058CA0;
}
header .tx{
	display: block;
	width:150px;
	height: 150px;
	border-radius: 150px;
	margin: 150px auto;
}
article{
	overflow-x: hidden;
	overflow-y: scroll;
	height: 100%;
}
article>*{
	margin:50px;
}